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Segmental Information - Financial information by reportable segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 29, 2024
Oct. 01, 2023
Sep. 29, 2024
Oct. 01, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]          
Net sales $ 99.4 $ 97.4 $ 288.5 $ 309.1  
Adjusted EBITDA 15.3 6.0 41.5 31.7  
Depreciation and amortization 2.6 3.2 7.5 9.8  
Restructuring charges (0.5) (1.6) (2.3) (4.4)  
Total assets 404.8   404.8   $ 372.1
Capital expenditures 3.0 2.5 7.3 7.6  
Discontinued operations          
Segment Reporting Information [Line Items]          
Total assets 7.8   7.8   7.8
Capital expenditures 0.0 0.0 0.0 0.1  
Gas Cylinders segment          
Segment Reporting Information [Line Items]          
Net sales 42.6 44.7 137.8 134.7  
Elektron segment          
Segment Reporting Information [Line Items]          
Net sales 48.8 45.6 128.5 151.0  
Graphic Arts          
Segment Reporting Information [Line Items]          
Net sales 8.0 7.1 22.2 23.4  
Operating segments          
Segment Reporting Information [Line Items]          
Total assets 337.1   337.1   313.0
Capital expenditures 3.0 2.5 7.3 7.5  
Operating segments | Gas Cylinders segment          
Segment Reporting Information [Line Items]          
Net sales 42.6 44.7 137.8 134.7  
Adjusted EBITDA 4.6 2.8 13.6 10.2  
Depreciation and amortization 0.9 1.1 2.6 3.2  
Restructuring charges (0.5) (1.4) (2.1) (4.2)  
Total assets 139.0   139.0   131.0
Capital expenditures 1.1 0.8 3.2 1.4  
Operating segments | Elektron segment          
Segment Reporting Information [Line Items]          
Net sales 48.8 45.6 128.5 151.0  
Adjusted EBITDA 10.8 6.0 29.6 25.0  
Depreciation and amortization 1.7 1.6 4.9 5.1  
Restructuring charges 0.0 (0.2) (0.2) (0.2)  
Total assets 183.8   183.8   162.4
Capital expenditures 1.8 1.6 3.9 5.5  
Operating segments | Graphic Arts          
Segment Reporting Information [Line Items]          
Net sales 8.0 7.1 22.2 23.4  
Adjusted EBITDA (0.1) (2.8) (1.7) (3.5)  
Depreciation and amortization 0.0 (0.5) 0.0 (1.5)  
Restructuring charges 0.0 0.0 0.0 0.0  
Total assets 14.3   14.3   19.6
Capital expenditures 0.1 0.1 0.2 0.6  
Other          
Segment Reporting Information [Line Items]          
Total assets 59.9   59.9   $ 51.3
Capital expenditures $ 0.0 $ 0.0 $ 0.0 $ 0.0